it sounds like a lot of science fiction, but amazon believes -- is this for real, ryan? >> wolf, jeff bezos is touting this as if it's very real. he says in four or five years, he hopes to be able to get your order to your door with a drone within a half hour after you place it. he's made point, click and shop a huge part of our lives. now amazon's ceo is promising delivery by drone. he unveiled his plan to cbs' "60 minutes". >> these are octocopters, but there's no reason they could be use as delivery vehicles. >> reporter: she says the vehicles they're developing can carry objects weighing up to five pounds, which he says covers 86% of the items they deliver. they can fly within 10 miles of any distribution center and they would be autonomous. that means no operator with a joystick. they'll program the coordinates of your house and it will fly there. but there are all sorts of potential pitfalls like how will they safeguard against from veers off-course and hitting us in the head? how will they avoid unknown obstacles on the roof? caitlin lee is a uav expert with ihs j